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follow up

Received the replacement Sigma 150mm EX DG OS HSM APO last week. This lens seems to be very sharp at f2.8. I have my own routine for testing new lenses and this one passed easily. The lens is a fine replacement for Sigma's original 150mm f2.8. With my 5D2 I can hand hold the lens to 1/25th second in flourescent lighting that requires F2.8 at ISO 3200 with -1 stop exposure adjustment. I do not know the lux value of that setting. I think that is EV -1. I do not think the OS is really good for 4 stops as advertised, but it is good for 2 stops for sure under these lighting conditions. That puts it on par with my Canon 300mm f4 L IS lens. I have no scientific evidence, but that's what it seems like to me. The auto focus with my 5D2 is a little quirky under the very dim conditions described above. By that I mean that it I can not always use the center af point alone. I have not tried this same test with my 7D, which has a better autofocus system than the 5D2.

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Re: follow up

<div id="linkdxomark"> With my 5D2 I can hand hold the lens to 1/25th second in flourescent lighting that requires F2.8 at ISO 3200 with -1 stop exposure adjustment.

1/25s, f/2.8, ISO3200 = 2.6 LV

If you have to use -1 EVcomp in camera to get the exposure you want, that means that you are getting the camera to expose shorter (considering just the variation of shutter speed) than its metering wants too, and that otherwise the camera would treat it as a 1.6 LV exposure.

If instead you apply -1 EV in post processing in your raw processor and no EVcomp in camera, that means that you think that the 2.6 LV exposure that the camera chose is too long and, in your opinion, the metering should have treated the scene as a 3.6 LV exposure.

Sigma 150mm F2.8 EX DG OS HSM APO

I received mine by UPS on June 29th. I sent it back to the distributor on July 1st. The OS was not functional and the resolution was horrible. I did ask for a replacement rather than my money back. My fingers are crossed. I really want a macro lens of this focal length, or longer, that has image stabilization and is somewhat weather sealed. Sigma's old 150mm is the lens I used most often with my Canon 5D and 7D cameras. I never used the lens indoors. It was always outside in the elements, so I had to send it in to get dust removed. Now, I am wishing I had kept that lens. Instead, I am hoping that the new model will live up to the quality of the old one.

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Re: Sigma 150mm F2.8 EX DG OS HSM APO

Sigma produces very good lenses,but quality control is really bad,only 3rd lense was without focus issues(I have 50/1.4)------------------------------------------------------http://photo-wed.blogspot.com/